Synthesizing metamaterials with angularly independent effective medium properties based on an anisotropic parameter retrieval technique coupled with a genetic algorithm

Abstract

Articles you may be interested inEffects of parameter variations on negative effective constitutive parameters of non-metallic metamaterials J. Appl. Phys. 113, 063501 (2013); 10.1063/1.4790714 Asymmetrical stripline based method for retrieving the electromagnetic properties of metamaterials J. Appl. Phys. 113, 024912 (2013); 10.1063/1.4775721Full extraction methods to retrieve effective refractive index and parameters of a bianisotropic metamaterial based on material dispersion models Determination of the effective parameters of a metamaterial by field summation method Effective properties of split-ring resonator metamaterials using measured scattering parameters: Effect of gap orientationIn this paper, we present a method to retrieve the effective electromagnetic parameters of a slab of anisotropic metamaterial from reflection and transmission coefficients ͑or scattering parameters͒. In this retrieval method, calculated or measured scattering parameters are employed for plane waves incident obliquely on a metamaterial slab at different angles. Useful analytical expressions are derived for extracting the homogeneous anisotropic medium parameters of a metamaterial. To validate the method, the effective permittivity and permeability tensor parameters for a composite split-ring resonator-wire array are retrieved and shown to be consistent with observations previously reported in the literature. This retrieval method is further incorporated into a genetic algorithm ͑GA͒ to synthesize an infrared zero-index-metamaterial with a wide field-of-view, demonstrating the utility of the new design approach. The anisotropic parameter retrieval algorithm, when combined with a robust optimizer such as GA, can provide a powerful design tool for exploiting the anisotropic properties in metamaterials to achieve specific angle dependant or independent responses.

Application of a Useful Uncertainty Analysis as a Metric Tool for Assessing the Performance of Electromagnetic Properties Retrieval Methods of Bianisotropic Metamaterials

“…Metamaterials (MMs) have generated an enormous research interest in recent years for their ability to exhibit electromagnetic properties not found in conventional materials [1][2][3][4][5][6], such as a refractive index that is negative [7]. Loosely defined, a MM is an artificial crystal in which mesoscopic inclusion structures of natural materials are similar to artificial dielectrics obtained by arranging a large number of identical conducting obstacles, simulating the behavior of a molecule (or a group of molecules) in an ordinary dielectric, in a regular three-dimensional (3-D) pattern [8].…”

Spatial transformation-enabled electromagnetic devices: from radio frequencies to optical wavelengths

“…Fortunately, with the development of metamaterial technology, previously inaccessible electric and magnetic material properties can be achieved by artificially structured building blocks [74][75][76]. By tailoring the resonant or non-resonant electric and magnetic responses of these subwavelength building blocks, which are typically arranged in a periodic fashion, negative [77,78], near-zero [79][80][81] or high [82,83] permittivity and permeability values can be realized along with a controllable degree of anisotropy [84,85]. The required inhomogeneous and/or anisotropic material properties of the transformation optics designs can thus be realized using specially designed metamaterials.…”

About the electromagnetic properties of the thin films of zinc metaferrites in microwave range

“…From the Landau-Lifshitz-Gilbert equation one obtains the relative permeability tensor for the unsaturated polycrystalline ferrites [2], [6]:…”